Clubs Due to the influence of his elder sister, Ishikawa started playing volleyball in 4th grade of Elementary School. His best achievement was the top 8 at the
All Japan Volleyball Elementary School Tournament when he was in 6th grade. In 2010, he won the bronze medal at the
All Japan Junior High School Volleyball Championship. Then, he was selected as a captain of Aichi Prefecture, and won the silver medal at the
JOC Junior Olympic Cup the same year. In High School, he became the first student to win "Triple Crown" at 3 tournaments:
Inter-High,
National Polity,
Haruko Volley for 2 consecutive years. According to an official of the Japan Association, he was the first student to challenge an overseas league through university, and was also the first university freshman to play volleyball in the
SuperLega. In the 2015–2016 season, he returned to Japan to continue playing for
Chuo University's club. In December 2016, he transferred to
Italy again, played for
Top Volley Latina until 2018. During this time, he was an exchange student while actually still playing for his university. After graduating from university in March 2018, Ishikawa signed his first professional contract with the Italian team
Emma Villas Siena (The club was ranked up to the
SuperLega in the 2018–2019 season). He moved to
Kioene Padova in the next season. He changed club again in 2020, to
Allianz Milano. Then, he extended his contract in the 2021–2022 season, continued to stay with the club for the 2022–2023 season, and re-signed for the fourth time for the next season. In the 10th and 11th seasons, he joined
Sir Susa Vim Perugia.
In the 2024–2025 season, Ishikawa and Perugia won the first title at the CEV Champions League. where the Japanese team finished in 17th place. He continued to compete in the
2013 FIVB Volleyball Men's U21 World Championship in
Turkey the same year, where the Japanese team finished in 10th place. In April 2014, Ishikawa entered
Chuo University (Faculty of Law, Department of Political Science), and was called for the
Japan men's national volleyball team for the first time. In September 2014, his debut competition was at the
2014 Asian Games in
Incheon,
South Korea. The Japanese team won the silver medal after losing to the
Iran team with a score of 1–3 in the final. In October 2014, he was part of the Japanese roster for the
2014 Asian Men's U20 Volleyball Championship in
Manama,
Bahrain, and led the team to finish in 5th place. In September 2015, Ishikawa participated in the
2015 FIVB Volleyball Men's World Cup in
Japan for the first time. The Japanese team finished in 6th place but he still won the "Best outside spiker" award of the
FIVB's tournament as a member of the senior national team. In July 2017, Ishikawa participated in the
2017 Asian Men's Volleyball Championship in
Gresik,
Indonesia for the first time because he was not called to the tournament in
2015. The Japanese team won the gold medal, and he also won the "Most valuable player, Best Outside Spiker" double award of the
AVC's tournament as a member of the senior national team. In 2021, Ishikawa became the captain of the
Japan men's national volleyball team, and was assigned to lead the team at the
2020 Summer Olympics in
Tokyo,
Japan. The Japanese team finished in 7th place after losing to the
Brazil team with a score of 0–3 in the quarterfinals. In September 2021, he led the team to win the silver medal at the
2021 Asian Men's Volleyball Championship, and won the "Best outside spiker" award as a captain of the senior national team. In July 2023, Ishikawa and the Japanese team won bronze medal at the
2023 FIVB Men's Volleyball Nations League after defeating the
Italy team with a score of 3–2 in the 3rd place match. He also won the "Best outside spiker" award as a captain of the senior national team. In August 2023, he led the team to win the 10th gold medal at the
2023 Asian Men's Volleyball Championship, and won the "Most Valuable Player" award as a captain of the senior national team. ==Special teams==